Browsing by Author/Contributor "Hofmeister, Anne M."

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The Effect of Stellar Evolution on SiC Dust Grain Sizes

Speck, Angela K.; Thompson, Grant D.; Hofmeister, Anne M. (American Astronomical Society, 2005)

Stars on the asymptotic giant branch (AGB) produce dust in their circumstellar shells. The nature of the dust-forming environment is influenced by the evolution of the stars, in terms of both chemistry and density, leading ...
Optical Constants of Silicon Carbide for Astrophysical Applications. II. Extending Optical Functions from Infrared to Ultraviolet Using Single-Crystal Absorption Spectra

Hofmeister, Anne M.; Pitman, K. M.; Goncharov, A. F.; Speck, Angela K. (American Astronomical Society, 2009)

Laboratory measurements of unpolarized and polarized absorption spectra of various samples and crystal structures of silicon carbide (SiC) are presented from 1200-35000 cm−1 (λ ∼ 8-0.28 μm) and used to improve the accuracy ...
Processing of Presolar Grains around Post-Asymptotic Giant Branch Stars: Silicon Carbide as the Carrier of the 21 Micron Feature

Speck, Angela K.; Hofmeister, Anne M. (Institute of Physics, 2004)

Some proto-planetary nebulae (PPNs) exhibit an enigmatic feature in their infrared spectra at ~21 μm. This feature is not seen in the spectra of either the precursors to PPNs, the asymptotic giant branch (AGB) stars, or ...